Guy's Scripting Ezine 129 - Mapping Network Drives

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Guy's Scripting Ezine 129 Mapping Network Drives

• This Week's Secret
• This Week's Mission
• Example 1 - Mapping a network drive with VBScript
• Example 2 - Mapping a network drive with PowerShell
• Guy's Challenges
• Summary of MapNetworkDrive with PowerShell

This Week's Secret

VBScript
Mapping network drives was my killer reason for learning VBScript.  Each week new readers join the ezine, for them I want to give examples so they can get started with VBScript.  A good place to start is a simple script to map a network share to local drive letter.

For the more experienced scripters, I want to remind them that methods such as MapNetworkDrive have five arguments.  The UNC path and the local drive letter are two of the obvious arguments.  Several readers and asked how you can map a network drive using different a different user, the answer is to add extra arguments for the user account and its password.

PowerShell
If you are new to PowerShell, then one learning tactic is to recreate tasks that you did in VBScript, but using PowerShell commands instead.  In the case of MapNetworkDrive, the answer is straightforward, in PowerShell create a Com object, which you then manipulate much like VBScript WScript.CreateObject.  See example 2.

Walk-through Tip
It seems that I am one of the few script writers who recommends a physical walk-through of the task in hand.  What a walk-through does is, a) Help in troubleshooting, b) remind us that a script can do anything we can do manually, c) In the case of Mapping a Network drive, reveal a box called reconnect at logon.  My point is that the 5th mapnetworkdrive argument is called bUpdateProfile, which is the equivalent of ticking the dialog box 'Reconnect at Logon' if map a drive using Windows Explorer.

This Week's Mission

This week I want to review mapping network drives in general and adding arguments for username and password in particular. 

Here are the five possible arguments for MapNetworkDrive:

objNetwork.MapNetworkDrive:
1) strDriveLetter, 2) strRemotePath, 3) bUpdateProfile, 4) strUser, 5) strPassword.

Incidentally, my old friend Mad Mick is wrong when he says the 'b' in UpdateProfile means 'bloody'. In fact, the 'b' stands for Boolean and the allowable values are either ="true" or ="false".

My secondary mission is to show you to how PowerShell can create com objects, which you can then manipulate to map a UNC path to a local drive letter.

Example 1 - Mapping a network drive with VBScript

Pre-requisites

1. On Line 15 change the server name from '\\grandserver' to your server name.
2. Make sure that the shared folder is called '\downloads'.  Alternatively, alter the word '\downloads' in the script to reflect a share on your server.

Instructions to MapNetworkDrive

1. Copy and paste the script below into notepad or get a script editor such as OnScript (free download).
2. Change the server name from "\\grandserver to the name of your server.
3. Check the share name '\files'.
4. Save the file with .vbs extension e.g. MapNetDrvArguments.vbs.
5. Double click the resulting logon script and look in your Windows Explorer for a new drive letter: sharename on 'grandserver' (J:)

Learning Points

Note 0:  To see the line numbers, get a script editor such as OnScript (free download).

Note 1:  If you don't have access to a server, create a share on your own machine.

Note 2: If you run the script for a second time, then you get WSH error message code 80070055.  The solution is launch Windows Explorer, just right click on: sharename on computer (J:) and select: Disconnect.  See diagram opposite.  Now you can run the script again.

Note 3: If you run the script a second time you get WSH error message code 800704xx, check the name of your server.

Note 4: Where a line of code is too long to fit on one line, use the _ (underscore) and then continue on the next line.  Microsoft's VBScript does not understand word-wrap so this is why you need underscore for statements that span two lines.

objNetwork.MapNetworkDrive strDriveLetter, strRemotePath, false, _
strUser, strPassword.

Note 5: The Sub Explorer() is solely for testing, it would be inappropriate to launch the explorer in a production script.  Talking of testing, I often add a line to remove the network drive in my test script. For example add this BEFORE the mapnetworkdrive line:
objNetwork.RemoveNetworkDrive, strDriveLetter

If you are looking for handy network utilities, try some of the free downloads at Tools4Ever

Example 2 - Mapping a network drive with PowerShell

As with Example 1, this script applies the MapNetworkDrive method to map a UNC path to a local drive letter.

Prerequisites

1. Install PowerShell RC2

Instructions

1. Save the following script with a .ps1 extension, for example PSMap.ps1
2. Launch PowerShell and navigate to the folder where you saved the .ps1 file
3. Call for your script file; at the command line PS>, type .\PSmap.ps1

Learning Points

Note 1: While PowerShell really does require fewer instructions than VBScript, this script exaggerates the effect by not using so many arguments.

Note 2: Whereas VBScript uses the ' Apostrophe for remarks, PowerShell uses the hash symbol for such # comments.

Note 3: -Com and -comObject seem interchangeable.  Also, as expected, powershell commands are not case sensitive.  I have deliberately drawn attention to this case insensitivity by using New-Object and then new-object.

Note 4: Cls is unnecessary, it is merely one of my quirks to clear my screen and show that at least something is happening should a test script fail.

Note 5: After you run the script for the first time, you may wish to remove the # in front of
# $net.removenetworkdrive($Drive).  This stops the script complaining that a drive has already been mapped.  For a production script we would need better error correcting code.

Guy's Challenges

Challenge 1:  At the PowerShell command line, review the $net arguments by typing:
$net | get-member

Challenge 2: Research other com objects that you can create in PowerShell by typing:
get-help new-object -full

Summary of MapNetworkDrive with PowerShell

It is reassuring that everything that you can create with VBScript, you can also achieve in PowerShell.  For methods such as MapNetworkDrive the secret is to create -com objects in powershell and then manipulate them with familiar VBScript commands.

MapNetworkDrive was also a useful vehicle to review what arguments a particular methods supports.

Guy Thomas recommends Computer Training Software. 

Their topics and material are ideal for getting you started with VBScript.  The videos are easy to follow and you can control the pace.  Try their free demo material and then see if you want to buy the full package. See more about VB Script Training CD.

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